Silver iodide is used for producing artificial rains because Agl

Options

A. is easy to spray at high altitude
B. is insoluble in water
C. is easy to synthesize
D. has crystals similar to ice

Answer

**Step-by-Step Solution:**

1. **Understanding the Concept of Artificial Rain:**
- Artificial rain is a process used to induce precipitation when natural rainfall is insufficient. It is often achieved through cloud seeding, which involves dispersing substances into the atmosphere to encourage rain.

2. **Identifying the Role of Silver Iodide (AgI):**
- Silver iodide is commonly used in cloud seeding because of its unique properties. One of the key reasons for its use is its crystalline structure.

3. **Analyzing the Crystalline Structure of AgI:**
- The crystal structure of silver iodide is similar to that of ice. This similarity is crucial because it allows AgI to act as an effective nucleus for water droplets in clouds.

4. **Mechanism of Rain Induction:**
- When silver iodide is dispersed into clouds, tiny water droplets in the clouds can adhere to the AgI crystals. As more droplets accumulate on the AgI, their combined weight increases.

5. **Formation of Raindrops:**
- Once the water droplets attached to the AgI crystals become heavy enough, they fall from the clouds, resulting in precipitation or artificial rain.

6. **Evaluating Other Options:**
- The other options provided in the question (ease of spraying at high altitude, insolubility in water, and difficulty in spraying) do not directly contribute to the effectiveness of AgI in inducing rain. The key factor is its crystalline structure.

7. **Conclusion:**
- Therefore, the correct reason for using silver iodide in artificial rain production is that it has a crystalline structure similar to ice, which facilitates the formation of larger water droplets that can fall as rain.

**Final Answer:**
Silver iodide is used for producing artificial rains because it has crystals similar to ice.

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